Lifting-jack.



glvwento 51E. 3 ch 06, 60,

PATBNTED MAR. 26, 1907.

A. E. SCHOUKE. LIFTIN G- JACK. APPLIOATIOH FILED um 1a 1906 lttonwn /U THE- NORR LlFTlNG-JACK.

No. 848,499. Specification of Letters Patent. Patented March 26, 1907. Application filed September 13,1906. Serial No. 334,489.

To (07/ 7/1/1012], it may concern:

Be it known that I, AUeUsT E. ScHocKE, a citizen of the United States, residing at VViliams, in the county of Thayer, State of N ebraska, have invented certain new and useful Improvements in Lifting-Jacks; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

ating-lever may be disposed or placed, all as will still more clearly appear from the description to follow.

14 designates the operating-lever that at its inner end extends between the plates 12 upper end of a dog 17 is pivoted. The free end of the said dog engages the ratchet-teeth 18 on one side of the ar 10 and is maintained in engagement with the said teeth by a compression-spring 19, that bears thereon at one of its ends, the other end of the spring bearing upon the tail 20 of a dog or pawl 21, that is pivoted to one of the side plates and at its efiicient free end also engages the teeth of the bar or standard 10. The pawl or dog 17 is provided with a trigger 22, that may extend through a slot in the face-plate to enable it to be operated to disengage the dog from the ratchet-teeth 18 when it is necessary to do so, and the lower dog 21 is provided with a trigger 23 for a purpose similar to trigger 22, the trigger 23 having its free end extended down between and slightly beyond the lower edge of the plates 12 in order that it may be reached to be operated.

he load will ordinarily rest upon the upper face 24 of the jack, which face is on the side of the bar or standard 10 opposite to that on which the operating-lever is pivoted.

ployed in pulling posts, stretching wire or woven fencing, laying flooring, setting up machinery, and in doing any kind of work where force or power is required and it is possible to bring the jack into requisition and he invention consists of a bar or standard provided with ratchet-teeth and a lever p1v ogs or pawls that cooperate with the said ratchet-teeth.

invention will first be described in detail and then be pointed out in the subjoined claim. f t 1e said drawings, Figure 1 is a side elevation of the invention, a part of the oper ating-lever and parts of the standard or bar being represented as broken off. Fig. 2 is also a side elevation of the invention with the l 14 up and down, which will have the effect of front plate of the jack proper removed. raising the lifting-pawl 17 tooth by tooth on imilar numerals of reference designate the standard 10 and have the holding-pawl similar parts or features, as the case may be, 21 operated in a similar manner. wherever they occur. l 0 lower a load on the jack, the operator In the drawings, 10 designates a vertical will press down on the lever, raising the jack standard or bar provided with a foot 11 of so that the lower or holding pawl 23 may be suitable size and form. tripped out of engagement with the tooth 18 12 designates the jack proper, consisting of the ratchet that it then has hold of in orof two plates of steel or other metal arranged der that it may take in the tooth next below on opposite sides of the standard and having by the gradual raising of the lever. After spacing and strengthening strips 13 of metal gaged from the tooth of the ratchet upon ger 22 and allowing the latter dog to also 95 bear on the jack and then to work the lever and on opposite sides of the bar 10, so that a x which it was pressing by pushing upon trigno take the next lower tooth, and by successive spacing bars or strips between them, and between certain of which the standard is adapted to pass, an operating-lever fulcrumed in the jack, a lifting-pawl pivoted on the operat its free end to enoperations of this kind, with the hands on the lever and the toe of the boot in engagement with the triggers 23 and 22, respectively, aload canbe let down easily and stead ily or the jack quickly let down from a higher ating-lever and adapted to a lower position. gage the teeth of the standard,a laterally- If the load should be very heavy, of course extended trigger connected with said pawl, a care will be exercised in letting it down, as holding-pawl pivoted in the jack an also also in raising it. adapted to engage the teeth of the standar It is obvious that the device may be used in an inclined or horizontal position for use in connections more numerous than is neces sary to mention, at this point, enough having already been cited to guide and give understanding to those skilled in the art as to the construction and various ways of employing the invention.

It is recognized that changes may be made in the form and arrangement constituting the invention without departing from its general nature or spirit.

What is claimed as the invention is A lifting-jack comprising a rack-standard,

a jack proper consisting of side plates and a spring between the tail of the holding-pawl to keep said pawls in engagement with standard, and a trigger connected holding-pawl and extending downward below the plates of the jack, to enable said trigger to be readily engaged by the toe of the boot and operated.

In testimony whereof I affix my signature in presence of two witnesses.

AUGUST E. SCHOCKEi Witnesses:

J. E. CONKLIN, J. K. ROBINSON. 

